4. 若 A 國的政府購買不變，但其定額稅由 100 降為 0，則該國均衡產出變為多少？

1. A permanganate solution is prepared by dissolving 20.0123 g KMnO<sub>4</sub> in 500 mL of distilled water and boiled for 1 hour to remove any organic material. After filtration, the solution is transferred to a 1.0 L volumetric flask and diluted to volume with distilled water. The permanganate solution was titrated against 0.2046 M oxalic acid prepared in sulfuric acid solution. A 50.00 mL aliquot of oxalic acid solution required 36.36 mL of permanganate solution. A titration blank required 0.08 mL of permanganate. What is the permanganate molarity? (The molecular mass of KMnO<sub>4</sub> is 158.04 g/mol.)\[ 5 \text{ H}_2\text{C}_2\text{O}_4 + 2 \text{ MnO}_4^- + 6 \text{ H}^+ \rightleftharpoons 10 \text{ CO}_2 + 2 \text{ Mn}^{2+} + 8 \text{ H}_2\text{O} \]

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4. 若 A 國的政府購買不變，但其定額稅由 100 降為 0，則該國均衡產出變為多少？

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